NPE when calling hasPreferenceValues or getPreferenceValues on newly created
FileDataModel
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Key: MAHOUT-410
URL: https://issues.apache.org/jira/browse/MAHOUT-410
Project: Mahout
Issue Type: Bug
Components: Collaborative Filtering
Affects Versions: 0.3
Reporter: Frank Scholten
Priority: Trivial
An NPE gets thrown when calling hasPreferenceValues() or
getPreferenceValue(long userID, long itemID) on a newly created FileDataModel.
This happens because these methods do not call checkLoaded() before forwarding
the method call to the delegate. Other overridden methods do call
checkLoaded(). Seems like a bug.
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